RE: 21 inch GMB carbine barrel range day
The balance of that little barrel is excellent. That was the first thing I noticed about it. Of course my 28" LRH 1-28 GMB is stainless steel and it really feels heavy when I do free hand shooting. This thing is almost like hauling around a toy. You would not think seven inches of barrel would weigh that much but it really does balance the rifle nice.
Underclocked.. I am sure that was happening. As cold as it was, had the barrel heated up... I'd of been glad.